6820121 has 16 divisors (see below), whose sum is σ = 8875008. Its totient is φ = 5082000.

The previous prime is 6820117. The next prime is 6820127. The reversal of 6820121 is 1210286.

It is not a de Polignac number, because 6820121 - 2² = 6820117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6820093 and 6820102.

It is not an unprimeable number, because it can be changed into a prime (6820127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155 + ... + 3696.

It is an arithmetic number, because the mean of its divisors is an integer number (554688).

Almost surely, 2^6820121 is an apocalyptic number.

It is an amenable number.

6820121 is a deficient number, since it is larger than the sum of its proper divisors (2054887).

6820121 is a wasteful number, since it uses less digits than its factorization.

6820121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 6820121 is about 2611.5361379847. The cubic root of 6820121 is about 189.6403260228.

The spelling of 6820121 in words is "six million, eight hundred twenty thousand, one hundred twenty-one".